Social EngineeringHealthcareHealthcarePhishingStolen CredentialsCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

Elkhorn Valley Rehabilitation Hospital

bd_9581aa015844d737 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 13, 2019

Filed

Apr 15, 2019

To disclose

5 weeks

Affected

2state residents only

Confidence

66%

Full breach record for Elkhorn Valley Rehabilitation Hospital →2 incidents on file

Elkhorn Valley Rehabilitation Hospital notified Montana workforce members of unauthorized access to email accounts in October 2018. The breach exposed names, DOBs, SSNs, bank info, and driver's licenses. The hospital hired forensic investigators and offered one year of Experian IdentityWorks credit monitoring.

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Incident timeline

undetected · 163 days

discovery → filing · 5 weeks / 33 days

Oct 1, 2018

Begins

Mar 13, 2019

Discovered

Apr 15, 2019

Filed

vs. sector median

8 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed2 affectedView incident

Name: Elkhorn Valley Rehabilitation Hospital
norm: elkhorn valley rehabilitation hospital

Name: Elkhorn Valley Rehabilitation Hospital
norm: elkhorn valley rehabilitation hospital
Industry: Healthcarellm

Discovered: Mar 13, 2019
Breach occurred: Oct 1, 2018
Undetected for: 163 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 15, 2019
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security numberDate of birth
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Hired a leading third-party forensic firm to investigate potential unauthorized access
Offering a complimentary one-year membership of Experian IdentityWorksSM Credit 3B
Emphasizing email security through staff education
Reviewing email security procedures
Changes made: Emphasizing email security through staff education
Reviewing email security procedures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(33 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://dojmt.gov/wp-content/uploads/OCP/CON-2019.04.15-MT-AG-Notice-EVRH.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 15, 2019
Raw hash: e4d57ee5962fb7f2a90afcc472509e8eca61179ccfe9fc86096bf2c7a6be3894

Reporting entityElkhorn Valley Rehabilitation Hospital

Victim entityElkhorn Valley Rehabilitation Hospital

Incidentdiscovered Mar 13, 2019

Stated responseHired a leading third-party forensic firm to investigate potential unauthorized access

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov